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Journal Articles

Skew scattering from correlated systems; Impurities and collective excitations in the spin Hall effect

Ziman, T.*; Gu, B.; Maekawa, Sadamichi

Journal of the Physical Society of Japan, 86(1), p.011005_1 - 011005_8, 2017/01

 Times Cited Count:1 Percentile:15.72(Physics, Multidisciplinary)

Journal Articles

What determines the sign of the spin Hall effects in Cu alloys doped with 5d elements?

Xu, Z.; Gu, B.; Mori, Michiyasu; Ziman, T.*; Maekawa, Sadamichi

Journal of Magnetism and Magnetic Materials, 400, p.184 - 187, 2016/02

 Times Cited Count:3 Percentile:20.49(Materials Science, Multidisciplinary)

Journal Articles

Strong suppression of the spin hall effect in the spin glass state

Niimi, Yasuhiro*; Kimata, Motoi*; Omori, Yasutomo*; Gu, B.; Ziman, T.*; Maekawa, Sadamichi; Fert, A.*; Otani, Yoshichika*

Physical Review Letters, 115(19), p.196602_1 - 196602_5, 2015/11

 Times Cited Count:11 Percentile:66.4(Physics, Multidisciplinary)

Journal Articles

Enhanced spin Hall effect by electron correlations in CuBi alloys

Gu, B.; Xu, Z.; Mori, Michiyasu; Ziman, T.*; Maekawa, Sadamichi

Journal of Applied Physics, 117(17), p.17D503_1 - 17D503_4, 2015/05

 Times Cited Count:6 Percentile:32.7(Physics, Applied)

Journal Articles

Analysis of the spin Hall effect in CuIr alloys; Combined approach of density functional theory and Hartree-Fock approximation

Xu, Z.; Gu, B.; Mori, Michiyasu; Ziman, T.*; Maekawa, Sadamichi

Journal of Applied Physics, 117(17), p.17D510_1 - 17D510_4, 2015/05

 Times Cited Count:4 Percentile:22.79(Physics, Applied)

Journal Articles

Sign change of the spin Hall effect due to electron correlation in nonmagnetic CuIr alloys

Xu, Z.; Gu, B.; Mori, Michiyasu; Ziman, T.*; Maekawa, Sadamichi

Physical Review Letters, 114(1), p.017202_1 - 017202_5, 2015/01

 Times Cited Count:15 Percentile:73.28(Physics, Multidisciplinary)

Journal Articles

Negatively charged muonium as a detector of electron spin polarization; A Puzzle and a possible theory

Gu, B.; Ziman, T.*; Maekawa, Sadamichi

JPS Conference Proceedings (Internet), 2, p.010301_1 - 010301_5, 2014/03

Journal Articles

Theory of the spin Hall effect, and its inverse, in a ferromagnetic metal near the Curie temperature

Gu, B.; Ziman, T.*; Maekawa, Sadamichi

Physical Review B, 86(24), p.241303_1 - 241303_5, 2012/12

 Times Cited Count:10 Percentile:45.04(Materials Science, Multidisciplinary)

Journal Articles

The Spin Hall effect as a probe of nonlinear spin fluctuations

Wei, D. H.*; Niimi, Yasuhiro*; Gu, B.; Ziman, T.*; Maekawa, Sadamichi; Otani, Yoshichika*

Nature Communications (Internet), 3, p.1058_1 - 1058_5, 2012/09

 Times Cited Count:26 Percentile:78.59(Multidisciplinary Sciences)

Journal Articles

Giant spin Hall effect of Au films with Pt impurities; Surface-assisted skew scattering

Gu, B.; Ziman, T.*; Guo, G.-Y.*; Nagaosa, Naoto; Maekawa, Sadamichi

Journal of Applied Physics, 109(7), p.070502_1 - 070502_3, 2011/03

We show theoretically a novel route to obtain giant room temperature spin Hall effect (SHE) using surface-assisted skew scattering. By a combined approach of density functional theory and the quantum Monte Carlo (QMC) method, we have studied the SHE due to a Pt impurity in different Au hosts. We show that the spin Hall angle (SHA) could become larger than 0.1 on the Au (111) surface, and decreases by about a half on the Au (001) surface, while it is small in bulk Au. The QMC results show that the spin-orbit interaction (SOI) of the Pt impurity on the Au (001) and Au (111) surfaces is enhanced, because the Pt 5$$d$$ levels are lifted to the Fermi level due to the valence fluctuations. In addition, there are two SOI channels on the Au (111) surface, while only one for Pt either on the Au (001) surface or in bulk Au.

Journal Articles

Surface-assisted spin Hall effect in Au films with Pt impurities

Gu, B.; Sugai, Isamu*; Ziman, T.*; Guo, G. Y.*; Nagaosa, Naoto; Seki, Takeshi*; Takanashi, Koki; Maekawa, Sadamichi

Physical Review Letters, 105(21), p.216401_1 - 216401_4, 2010/11

 Times Cited Count:63 Percentile:90.42(Physics, Multidisciplinary)

Journal Articles

Quantum renormalization of the spin hall effect

Gu, B.; Gan, J.-Y.*; Bulut, N.*; Ziman, T.*; Guo, G.-Y.*; Nagaosa, Naoto*; Maekawa, Sadamichi

Physical Review Letters, 105(8), p.086401_1 - 086401_4, 2010/08

 Times Cited Count:30 Percentile:80.42(Physics, Multidisciplinary)

By quantum Monte Carlo simulation of a realistic multi-orbital Anderson impurity model, we have studied the spin-orbit interaction (SOI) of an Fe impurity in Au host metal. We have shown, for the first time, that the SOI is strongly renormalized by the quantum spin fluctuation. Based on this mechanism, we could explain why the gigantic spin hall effect in Au with Fe impurities was observed in recent experiment, while it is not visible in the anomalous hall effect. In addition, we have shown that the SOI is strongly renormalized by the coulomb correlation $$U$$. Based on this picture, we could explain past discrepancies in the calculated orbital angular momenta for an Fe impurity in Au host.

Journal Articles

Dzyaloshinski-Moriya interaction in the 2D spin gas system SrCu$$_{2}$$(BO$$_{3}$$)$$_{2}$$

C$'e$pas, O.*; Kakurai, Kazuhisa; Regnault, L. P.*; Ziman, T.*; Boucher, J. P.*; Aso, Naofumi*; Nishi, Masakazu*; Kageyama, Hiroshi*; Ueda, Yutaka*

Physical Review Letters, 87(16), p.167205_1 - 167205_4, 2001/10

 Times Cited Count:100 Percentile:92.6(Physics, Multidisciplinary)

no abstracts in English

Oral presentation

Giant spin Hall effect of Au films with Pt impurities; Surface-assisted skew scattering

Gu, B.; Ziman, T.*; Guo, G.-Y.*; Nagaosa, Naoto*; Maekawa, Sadamichi

no journal, , 

Oral presentation

Theory of anomalous Hall and spin Hall effects in ferromagnetic metals

Gu, B.; Ziman, T.*; Maekawa, Sadamichi

no journal, , 

Oral presentation

Oral presentation

Oral presentation

Oral presentation

Theoretical studies of novel doped ferromagnetic semiconductor systems

Gu, B.; Ziman, T.*; Maekawa, Sadamichi

no journal, , 

Oral presentation

Manipulation of the sign of the spin Hall effect using Cu alloys doped with 5d elements

Xu, Z.; Gu, B.; Mori, Michiyasu; Ziman, T.*; Maekawa, Sadamichi

no journal, , 

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